Very Imp MCQ's | 11th Chemistry Bhaukal Batch | By Vikram sir | Doubtnut

Why Class 11th is Very Important?

Read the following information carefully to answer the questions that follow. In a survey of 25 students, it was found that 15 have taken Mathematics. 12 have taken Physics and 11 taken Chemistry, 5 have taken Mathematics and Chemistry, 9 have taken Mathematics and Physics, 4 have taken Physics and Chemistry and 3 have taken all the three subjects. Consider the following statements I. The number of students who have taken only one subject is equal to the number of students who have taken only two subjects. II. The number of students who have taken at least two subjects is four times the number of students who have taken all the three subjects. Which of the above statement(s) is/are correct?

The mass of planet mars is 1/10 th of the mass of earth and radius is 1/2 of the radius of earth. If the scape velocity at the earth is 11.2km/s, then the scape velocity at Mars will be

The mass of the moon is 7//81 th of earth 's mass and its radius is 1//4 th that of the earth if the escape velocity from the earth surface is 11.2 kms^(-1) its value for the moon will be

The average of thirteen numbers is 47. The average of the first three numbers is 39 and that of next seven numbers is 49. The 11^(th) number is two times the 12^(th) number and 12^(th) number is 3 less that the 13^(th) number. What is the average of 11^(th) and 13^(th) numbers ?

The average of thirteen numbers is 47. The average of the first three numbers is 39 and that of the next seven numbers is 49. The 11th number is two times the 12th number and 12th number is 3 less than the 13th number. What is the average of 11th and 13th numbers? तेरह संख्याओं का औसत 47 है | पहली तीन संख्याओं का औसत 39 है तथा अगली सात संख्याओं का औसत 49 है | 11वीं संख्या 12वीं संख्या से दोगुनी है तथा 12वीं संख्या 13वीं संख्या से 3 कम है | 11वीं और 13वीं संख्याओं का औसत ज्ञात करें |

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